Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43f26545b0838c3…

MALICIOUS

PDF

75.0 KB Created: 2021-03-27 18:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2580a0982cbd3d8f5ece85a7cbc10f40 SHA-1: 58235a572e0956d29f22867d5079ca7cdaf57cb3 SHA-256: a43f26545b0838c38a5c0e86d6fc9eb7aeda2e0508fe5c1747d55bfa039a5f42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to suspicious domains like 'vilenefex.ru' and 'fosonelotila.medianewsonline.com'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8673

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=asnt+rp+snt+tc+1a+pdf
    • http://fosonelotila.medianewsonline.com/burapaz.pdf
    • https://cdn.sqhk.co/jufebarur/Xjgihjf/fun_reading_ideas_for_middle_school.pdf
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fd1092fbf7b9.pdf
    • http://lajodibibodi.getenjoyment.net/zarenetefatimumadakaxix.pdf
    • https://cdn.sqhk.co/bubiwalifeda/jijfbhb/best_brawler_in_brawl_stars_2020_october.pdf
    • http://tuvurebomiworo.scienceontheweb.net/37931815529.pdf
    • https://static.s123-cdn-static.com/uploads/4392210/normal_5fe312e2801e4.pdf
    • https://cdn-cms.f-static.net/uploads/4370317/normal_602c0b8f3b836.pdf
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fd256953f57d.pdf
    • http://potuxoposutu.medianewsonline.com/zidisebiregimipep.pdf
    • https://cdn.sqhk.co/mizipudi/ghftI2O/mudding_locations_near_me.pdf
    • https://cdn.sqhk.co/winelolibug/uhfgdDn/how_to_add_stickers_on_snapseed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/748d76f3-2e1b-49ce-8371-bd660b5c5e8a/the_kid_who_ran_for_president_activities.pdf
    • https://uploads.strikinglycdn.com/files/ad763dd8-80fc-415d-a3bd-1c49f10d9551/what_is_another_word_for_making_progress.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_cf7e5c54b2644bcc8a249d112607d29a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15ad8ee0-a22c-410b-9a7a-27e6e5a0109b/zufokedejidepelikogalep.pdf
    • https://uploads.strikinglycdn.com/files/b635c842-7c55-4a2a-991c-a617725c5816/955569848.pdf
    • https://uploads.strikinglycdn.com/files/84009072-4b0b-4bf0-83bc-7b8256bdaa3a/panasonic_lumix_dmc-fz70_manual_espaol.pdf
    • https://uploads.strikinglycdn.com/files/b27c6cbb-9fb9-448a-b183-6697d768bcc8/80647565870.pdf
    • https://uploads.strikinglycdn.com/files/20d84222-a899-463f-9548-ee22070453a8/97679812148.pdf
    • https://uploads.strikinglycdn.com/files/cfbbefd0-8b60-4561-9715-636d614bfc41/kiss_the_rain_yiruma_sheet_music_easy.pdf
    • https://uploads.strikinglycdn.com/files/0ff12529-c431-4c63-9bd6-b3839d5ccc08/hp_10bii_financial_calculator_change_decimal_places.pdf
    • http://sofibimibojas.myartsonline.com/xujosotubob.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_f521aca86be94afe862ba52abcbd2a08.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eddb.bin
a788dd15a22feb2ff2411aefa91daea287a911a3d37d5324329692500c3ef438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 4668 bytes
font_01_sfnt_off0000fdae.bin
a2354d07e0c1623375069589dec9ef68d0495ed453997e5b3a96aaa4951a6c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 11144 bytes

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